| Ultrasound Measurements of Kidney Size in the Elderly without Renal Disease |
| Young Shin Shin, M.D.1, Soo Yun Park, M.D.2, Dong Chan Jin, M.D.1, Hyung Wook Kim, M.D.1, Yong Soo Kim, M.D.1, Yoon Sik Chang, M.D.1 and Byung Kee Bang, M.D.1 |
Department of Internal Medicine1 and Radiology2
College of Medicine The Catholic University of Korea, Seoul, Korea |
| 임상연구 : 신장질환이 없는 80세 이상 노인에서 초음파로 측정한 신장의 크기 |
| 신영신1, 박수연2, 진동찬1, 김형욱1, 김용수1, 장윤식1, 방병기1 |
| 가톨릭대학교 의과대학 내과학교실1, 방사선과학교실2 |
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| Abstract |
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Purpose : Kidney size (KS) is used to diagnose the patients with renal disease. When the length of a kidney is measured under 9 cm, it is considered to indicate an irreversible disease. Because glomerular filtration rate (GFR) decreases with age, the normal range of KS in the elderly is indefinite. Therefore, we measured KS in adults older than 80 years old and investigated correlated factors.
Methods : One hundreds six adults (51 men, 55 women: mean age 83±0.3) without renal disease were included. Their serum creatinine (Scr) levels did not exceed 1.3 mg/dL, and the calculated GFR were over 60 mL/min/1.73m2. Abdominal ultrasonography were performed to all of them and their body indexes (BI) were measured.
Results : 1) The mean length of kidney was 9.9±0.07 cm. 2) KS in the early eighties was larger than that of adults over ninety. 3) KS showed negative correlations with age and Scr, but a positive correlation with body surface area . 4) The calculated GFR showed correlations with the surface areas of both kidney (BK) by C-G equation and with the size of BK by MDRD equation. 4) The GFR calculated by MDRD and C-G equation presented inverse correlations with Scr, but only MDRD equation showed a statistic significance.
Conclusion : In the elderly, KS may be smaller than that of younger adults. Other factors such as either surface area or volume of BK and BI should be considered to estimate the individual KS to decide whether the size is within normal range.
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| Key Words:
Kidney, Organ size, Elderly, Body size, Glomerular filtration rate |
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